Cast wheel



(No Model.)

' M. DE WITT LOOMIS.

CAST WHEEL, PULLEY, &o. No. 334,178. Patented. Jan 12, 1886,

NITED STATES M. DE VVITT LOOMIS, OF PITTSBURG, PENNSYLVANIA.

CAST WHEEL, PULLEY, 84.0.

SPECIFICATION forming part of Letters Patent No. 334,178, dated January 12, 1886. Application filed October 19, 1885. Serial No. 180,377. (No model.)

To all whom it may concern.-

Be it known that I, M. DE Wrrr Looms, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Cast Wheels, Pulleys, &c.; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to the construction of pulleys and other wheels having cylindrical metallic hubs, and of engine cylinders and other articles requiring true and regular inner surfaces.

As heretofore made, metallic pulleys have been cast with either solid or cylindrical hubs. hen the hub was solid it had to be bored out with great care and accuracy, to obtain a perfectly true hole for the shaft on which the pulley was intended to be used. WVhen the hole was cast in, so as to make a cylindrical hub, it had still to be finished in the same way and for the same purpose. This work involved the construction and use of expensive machinery, and necessitated the employment of highly skilled and consequently expensive labor, and a loss of time.

Engine-cylinders are made by casting and then finishing the inside by suitable boring machinery. The inside must be perfectly true, or the cylinder is defective, and ordinarily entirely useless.

The great utility of my invention consists in obviating the necessity of boring, planing, and finishing the bore or cylindrical opening of pulleys and other metallic wheels and cylinders.

To enable others skilled in the art to which my invention appertains to make the same, I will now describe it by reference to the annexed drawings, in which- Figure 1 is a section of a pulley, and Fig. 2 is a longitudinal section of a cylinder, both illustrating my invention.

Like letters of reference indicate like parts.

I take a piece of iron or steel tubing, a, preferably of the kind known as cold-drawn tubing, of the proper length and thickness, and having a bore of the required diameter to suit the Wheel or cylinder to be made, and I place this piece of tubing in the wheel or cylinder mold, and then cast the wheel or cylinder 1) on it as on a core. The molten metal (preferably iron or steel) unites with the exterior of the tube, so that the tube forms merely an inner shell for the cylindrical part. The inner surface of the tube should be perfectly true and polished before being put into the mold, so that when the wheel comes from the mold it will require little or no machine-work to fit it to the shaft, if a wheel, or for use, if a cylinder. If, however, the inner surface of the tube should not be exactly true and properly finished, it can be put in proper condition with very much less labor, time, and expense than a wheel or cylinder made in the old way. It is preferred, however, to use the welded seamless tubing, because it possesses not only a perfectly true inner surface, but also a highly polished one.

If desired, the tubing may be filled with sand or other material before being put into the mold, but it should be such as would not be caused to adhere to the surface of the metal by the heat imparted to the tube by the molten metal. If the inner surface of the tube is rough after the external structure has been cast on it, it can be made smooth and true by drawing a die through it, or it may be bored out. In either case the labor and expense of working on the malleable metal of the core is much less than boring out the castings heretofore used.

This invention is of great utility. It takes away the principal item of cost, aside from the material, and insures as good if not a better article. It enables a broken or damaged pulley or cylinder to be replaced by a new one in a comparatively short time, because little or no boring is required. It has often been the case that mills have been stopped for days from this reason, the principal cause of delay being the time occupied in' boring out and finishing.

My invention is especially useful with iron and steel, the tube being malleable and the outer structure of cast metal. I wish, however, to claim it in connection with other metals.

The term cylinder, as used in the claim, is designed to include not only engine and ICO similar cylinders, but also all wheels having A metal cylinder having an inner cylindrical hollow hubs, the bore of which can be formed shell of malleable metal tubing, and an exterby a malleable tube. nal structure of metal cast thereon, substan- I am aware that it has been proposed to I tially as and for the purposes described. :5 5 cast the bracket of shaft-hangers upon the In testimony whereof I have hereunto set surface of the cast-iron box or bearing in which my hand this 236. day of September, A. D. the shaft turns. I do not claim this, nor, 1885.

broadly, the casting of metal upon another M. DE VVITT LOOMIS. piece of metal. Witnesses: o What I claim as my invention, and desire WV. B. CoRWIN,

to secure by Letters Patent, is- THOMAS B. KERR. 

